In [131]:
2 + 2
Out[131]:
4
In [132]:
17.35*1.15
Out[132]:
19.9525
In [133]:
2
Out[133]:
2
In [134]:
2+2
Out[134]:
4
In [135]:
5-25
Out[135]:
-20
In [136]:
2 +

  File "/tmp/ipykernel_4412/4162224534.py", line 1
    2 +
       ^
SyntaxError: invalid syntax
In [ ]:
(2 + 2) * (3 - 1)
In [ ]:
(5 + 5) * (3 - 1)
In [ ]:
(5 + 5) * (8 - 1)
In [ ]:
 def double(sequence):
        result = []
        for element in sequence:
            result = result + [element*2]
        return result
In [ ]:
double([1, 10, 5])
In [137]:
double([-42,0,42])
Out[137]:
[-84, 0, 84]
In [138]:
double([24])
Out[138]:
[48]
In [139]:
double([])
Out[139]:
[]
In [140]:
double()

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_4412/2608569975.py in <module>
----> 1 double()

TypeError: double() missing 1 required positional argument: 'sequence'
In [ ]:
# THE AUTHOR'S EXPLANATION: This function takes exactly one sequence as an argument and returns a sequence in which each of the original elements are doubled.
In [ ]:
x = [1,2,3]
double(x)
In [141]:
double(5)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_4412/1555949217.py in <module>
----> 1 double(5)

/tmp/ipykernel_4412/2548933476.py in double(sequence)
      1 def double(sequence):
      2        result = []
----> 3        for element in sequence:
      4            result = result + [element*2]
      5        return result

TypeError: 'int' object is not iterable
In [ ]:
double([1,2,3])
double([1,2][2,4])
In [ ]:
 def triple(sequence):
        result = []
        for element in sequence:
            result = result + [element*3]
        return result
In [142]:
triple([2,4,5])
Out[142]:
[6, 12, 15]
In [143]:
triple([7,3])
Out[143]:
[21, 9]
In [144]:
 def addtwo(sequence):
        result = []
        for element in sequence:
            result = result + [element+2]
        return result
In [145]:
addtwo([45])
Out[145]:
[47]
In [146]:
addtwo([100])
Out[146]:
[102]
In [147]:
 def half(sequence):
        result = []
        for element in sequence:
            result = result + [element/2]
        return result
In [148]:
half([4,2,10,6])
Out[148]:
[2.0, 1.0, 5.0, 3.0]
In [149]:
   4+5+0.375
Out[149]:
9.375
In [150]:
1500*0.08875
Out[150]:
133.125
In [151]:
995.50*0.08875
Out[151]:
88.350625
In [152]:
100*0.08875
Out[152]:
8.875
In [153]:
def return(subtotal):
    return subtotal * 0.08875

  File "/tmp/ipykernel_4412/1390939789.py", line 1
    def return(subtotal):
             ^
SyntaxError: invalid syntax
In [ ]:
def tax(subtotal):
    return subtotal * 0.08875
In [ ]:
tax(1500)
In [ ]:
1500 + tax(1500)
In [154]:
200 + 1500 + tax(1500)
Out[154]:
1833.125
In [155]:
sum = 1500
sum = sum + sum * 0.08875 #Add the tax amount
In [156]:
sum
Out[156]:
1633.125
In [157]:
def set_a():
    a = 10
    print('The value of a:', a)
In [158]:
set_a()

The value of a: 10
In [159]:
a = 20
print('Initially, the value of a:', a)
set_a()
print('Finally, the value of a:', a)

Initially, the value of a: 20
The value of a: 10
Finally, the value of a: 20
In [160]:
def scoped(first,second):
    third = second + second - first
    return third
first = 10
second = 11
third = 12
scoped(2,4)
Out[160]:
6
In [161]:
first
Out[161]:
10
In [162]:
second
Out[162]:
11
In [163]:
third
Out[163]:
12
In [164]:
scoped(1,2)
Out[164]:
3
In [165]:
l = [7,4,2,6]
In [166]:
for num in l:
    print(num)

7
4
2
6
In [167]:
for num in l:
    print(num*2)

14
8
4
12
In [168]:
l
Out[168]:
[7, 4, 2, 6]
In [169]:
def mean(sequence):
    total = 0
    for element in sequence:
        total = total + element
    return total / len(sequence)
In [170]:
temperature - 80

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/tmp/ipykernel_4412/3334237015.py in <module>
----> 1 temperature - 80

NameError: name 'temperature' is not defined
In [ ]:
short = [5,5,5,5]
In [ ]:
mean(short)
In [ ]:
tall = [10, 8, 12, 18]
In [ ]:
mean(tall)
In [ ]:
(10 + 8 + 12 + 18)/4
In [ ]:
age = 21, 23, 24, 26
In [ ]:
mean(age)
In [ ]:
x = 5
In [171]:
type(x)
Out[171]:
str
In [172]:
type(5)
Out[172]:
int
In [173]:
x = 'hello world'
In [174]:
type(x)
Out[174]:
str
In [175]:
type('hello world')
Out[175]:
str
In [176]:
type([1,2,3])
Out[176]:
list
In [177]:
'hello' + 'world'
Out[177]:
'helloworld'
In [178]:
'knock' + 'knock'
Out[178]:
'knockknock'
In [179]:
a = 'hello'
b = 'world'
a + b
Out[179]:
'helloworld'
In [180]:
len('hello world')
Out[180]:
11
In [181]:
len([1,2,3])
Out[181]:
3
In [182]:
len(['hello', 'world'])
Out[182]:
2
In [183]:
len(5)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_4412/4108502181.py in <module>
----> 1 len(5)

TypeError: object of type 'int' has no len()
In [ ]:
2+'hello'
In [ ]:
len(str(5))
In [ ]:
str(2) + 'hello'
In [184]:
volume = [4.0, 2.0, 3.0, 5.5]
result = []
for element in volume:
    result = result + [element*2]
result
Out[184]:
[8.0, 4.0, 6.0, 11.0]
In [185]:
result = []
result
Out[185]:
[]
In [186]:
result = result + [4.0]
result
Out[186]:
[4.0]
In [187]:
result = result+[2.0]
result
Out[187]:
[4.0, 2.0]
In [188]:
result = result+[3.0]
result
Out[188]:
[4.0, 2.0, 3.0]
In [189]:
result = result+[5.5]
result
Out[189]:
[4.0, 2.0, 3.0, 5.5]
In [190]:
result = []
result = result+[4.0]
In [191]:
double(volume)
Out[191]:
[8.0, 4.0, 6.0, 11.0]
In [192]:
words = ['hello', 'world']
In [193]:
double(words)
Out[193]:
['hellohello', 'worldworld']
In [194]:
countdown = [3,2,1, 'contact']
double(countdown)
Out[194]:
[6, 4, 2, 'contactcontact']
In [195]:
double('abstraction')
Out[195]:
['aa', 'bb', 'ss', 'tt', 'rr', 'aa', 'cc', 'tt', 'ii', 'oo', 'nn']
In [196]:
double(['abstraction', 'abstraction'])
Out[196]:
['abstractionabstraction', 'abstractionabstraction']
In [197]:
2 + 2 == 4
Out[197]:
True
In [198]:
2+2 == 3+1
Out[198]:
True
In [199]:
2+2==2+1
Out[199]:
False
In [200]:
greeting = 'hello'
In [201]:
greeting == 'hi'
Out[201]:
False
In [202]:
def secret(word):
    if word == 'please':
        return 'Yes!'
In [203]:
secret('hello')
In [204]:
secret('world')
In [205]:
secret('please')
Out[205]:
'Yes!'
In [206]:
secret('PLEASE')
In [211]:
def yesno(word):
    if word == 'yes':
        return True
    if word == 'no':
        return False
In [212]:
yesno('haha')
In [213]:
yesno('no')
Out[213]:
False
In [214]:
yesno('yes')
Out[214]:
True
In [215]:
yesno('Yes')
In [224]:
if word == 'please':
    return 'yes!'
else:
    return 'No.'

  File "/tmp/ipykernel_4412/19293911.py", line 2
    return'yes!'
    ^
SyntaxError: 'return' outside function
In [ ]:
#Why SyntaxError "return outside funtcion"? Ask in class
In [225]:
def secret(word):
    if word == 'please':
        return True
    else:
        return False
In [227]:
secret('please')
Out[227]:
True
In [228]:
secret('helloworld')
Out[228]:
False
In [229]:
def secret(word):
    return (word == 'please')
In [230]:
secret('please')
Out[230]:
True
In [231]:
10/0

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
/tmp/ipykernel_4412/530406163.py in <module>
----> 1 10/0

ZeroDivisionError: division by zero
In [232]:
'hi'*2
Out[232]:
'hihi'
In [233]:
'hihi'*2
Out[233]:
'hihihihi'
In [234]:
def half(sequence):
        result = []
        for element in sequence:
            result = result + [element/2]
        return result
In [236]:
half([7, 9, 250])
Out[236]:
[3.5, 4.5, 125.0]
In [254]:
def exclaim(sequence):
    result = []
    for element in sequence:
        result = result + [element + '!']
    return result
In [257]:
exclaim(['hello'])
Out[257]:
['hello!']
In [258]:
exclaim(['world'])
Out[258]:
['world!']
In [261]:
exclaim(['hello','world'])
Out[261]:
['hello!', 'world!']
In [ ]:
#ask about exercise 6-2, second step.